Opening apparatus of fiber bundle

ABSTRACT

An opening apparatus of a fiber bundle includes a horizontal vibration device including a plurality of horizontal vibration rolls to apply horizontal direction vibration to the fiber bundle according to a type of the fiber bundle, where the plurality of horizontal vibration rolls have different shapes. In the opening apparatus, the opening efficiency of the fiber bundle may be increased by applying horizontal vibrations to the fiber bundle through the plurality of horizontal vibration rolls according to a type of the fiber bundle.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims under 35 U.S.C. §119(a) the benefit of Korean Patent Application No. 10-2014-0168283 filed in the Korean Intellectual Property Office on Nov. 28, 2014, the entire contents of which are incorporated herein by reference.

BACKGROUND

(a) Technical Field

The present invention relates to an opening apparatus of a fiber bundle, more particularly, to an opening apparatus of a fiber bundle capable of maximizing efficiency of fiber opening by disposing various vibration rolls according to a type of fiber.

(b) Description of the Related Art

In recent years, a composite material exhibiting strength of a metal and light weight and formability of a plastic material has been developed. For example, the composite material may include a Fiber Reinforced Plastic (FRP) and Carbon Fiber Reinforced Plastic (CFRP).

The above composite material is an advanced composite which is a light-weight structural material with high strength and high elasticity using a fiber (carbon or glass fiber) as a reinforcement material, and exhibits excellent material characteristics.

When producing the composite material using the carbon fiber or the glass fiber, there is a need for an opening process of widely spreading the fiber bundle. Particularly, an opening process is very important in a fiber bundle having a many fiber numbers.

There are various types of fiber bundles. Particularly, since a glass fiber has a higher specific gravity than that of carbon fiber, an opening effect using compressed air or vertical vibration is relatively low as compared with the carbon fiber. In contrast, the carbon fiber has a lower specific gravity than that of the glass fiber, the opening effect using compressed air or vertical vibration is relatively high as compared with the glass fiber, but a compaction phenomenon occurs between partial filaments. Accordingly, a need for an opening process and an opening apparatus meeting characteristics of a fiber has increased.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

SUMMARY

The present invention provides an opening apparatus of a fiber bundle having advantages of improved fiber opening efficiency according to a material of a fiber. An exemplary embodiment of the present invention provides an opening apparatus of a fiber bundle, including a horizontal vibration device including a plurality of horizontal vibration rolls to apply horizontal direction vibration to the fiber bundle according to a type of the fiber bundle, where the plurality of horizontal vibration rolls have different shapes.

One of the plurality of horizontal vibration rolls may include a first horizontal vibration roll having a cylindrical shape where a diameter becomes gradually reduced in a direction of an exterior circumference from a center thereof.

Another of the plurality of horizontal vibration rolls may include a second horizontal vibration roll having a cylindrical shape where a diameter becomes gradually reduced in a direction of an exterior circumference from a center thereof.

Another of the plurality of horizontal vibration rolls may include a third horizontal vibration roll having a cylindrical shape having a same diameter.

Another of the plurality of horizontal vibration rolls may include a fourth horizontal vibration roll having a cylindrical shape having a same diameter and including protrusions and depressions formed at an exterior circumference of the fourth horizontal vibration roll.

When the fiber bundle is a carbon fiber, the horizontal direction vibration may be applied to the fiber bundle in an order of the first horizontal vibration roll, the second horizontal vibration roll, and the third horizontal vibration roll.

A curvature radius of an exterior circumference of the second horizontal vibration roll may be greater than a curvature radius of an exterior circumference of the first horizontal vibration roll.

When the fiber bundle is a glass fiber, the horizontal direction vibration may be applied to the fiber bundle in an order of the third horizontal vibration roll, the first horizontal vibration roll, and the fourth horizontal vibration roll. The opening apparatus of a fiber bundle may further include a width controller provided at a lower stream region of the horizontal vibration device to control a width of the fiber bundle.

The width controller may include a bottom plate, guide walls provided at both sides of the bottom plate to guide the fiber bundle, respectively, and guide plates coupled with the guide walls by a hinge, respectively.

The width controller may further include a ruler to display an open amount of the guide plate.

The opening apparatus of a fiber bundle may further include a horizontal vibration device provided at an upper stream region of the horizontal vibration device to apply the horizontal direction vibration to the fiber bundle.

The opening apparatus of a fiber bundle may further include an air supply device provided at the upper stream region of the horizontal vibration device to blow compressed air into the fiber bundle.

The air supply device may include an air blower to generate compressed air, and an air control valve to control an air amount of the air blower.

In accordance with the opening apparatus of a fiber bundle according to an exemplary embodiment of the present invention as described above, the opening efficiency of the fiber bundle may be increased by applying horizontal vibrations to the fiber bundle through a plurality of horizontal vibration rolls according to a type of the fiber bundle.

Further, when a prepreg is manufactured after the opening process, the prepreg manufacturing quality may be improved by controlling a width of an open fiber bundle through a width controller.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following detailed description, only certain exemplary embodiments of the present invention have been shown and described, simply by way of illustration.

FIG. 1 is a schematic view illustrating an opening apparatus of a fiber bundle according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic view illustrating an opening apparatus of a fiber bundle according to another exemplary embodiment of the present invention.

FIG. 3A and FIG. 3B are views illustrating an air supply device according to an exemplary embodiment of the present invention.

FIG. 4A and FIG. 4B are views illustrating a vertical vibration device according to an exemplary embodiment of the present invention.

FIG. 5A and FIG. 5B are views illustrating a first horizontal vibration roll according to an exemplary embodiment of the present invention.

FIG. 6A and FIG. 6B are views illustrating a second horizontal vibration roll according to an exemplary embodiment of the present invention.

FIG. 7A and FIG. 7B are views illustrating a third horizontal vibration roll according to an exemplary embodiment of the present invention.

FIG. 8A and FIG. 8B are views illustrating a fourth horizontal vibration roll according to an exemplary embodiment of the present invention.

FIG. 9A and FIG. 9B are plan views illustrating a width controller according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

For the purpose of clear description of an exemplary embodiment of the present invention, parts which are not related to the description are omitted. The same reference numbers are used throughout the specification to refer to the same or like parts.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Throughout the specification, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. In addition, the terms “unit”, “-er”, “-or”, and “module” described in the specification mean units for processing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

Further, the size and thickness of each configuration shown in the drawings are optionally illustrated for better understanding and ease of description, the present invention is not limited to shown drawings, and the thickness of a plurality of parts and regions is exaggerated for clarity.

It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.

Further, the control logic of the present invention may be embodied as non-transitory computer readable media on a computer readable medium containing executable program instructions executed by a processor, controller or the like. Examples of computer readable media include, but are not limited to, ROM, RAM, compact disc (CD)-ROMs, magnetic tapes, floppy disks, flash drives, smart cards and optical data storage devices. The computer readable medium can also be distributed in network coupled computer systems so that the computer readable media is stored and executed in a distributed fashion, e.g., by a telematics server or a Controller Area Network (CAN).

Hereinafter, an opening apparatus of a fiber bundle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in the alternate embodiments of FIGS. 1 and 2, the opening apparatus of a fiber bundle according to exemplary embodiments of the present invention includes an air supply device 100, a vertical vibration device 200, a horizontal vibration device 300, and a width controller 400.

In the opening apparatus of the fiber bundle, according to a moving order of the fiber bundle, the air supply device 100, the vertical vibration device 200, the horizontal vibration device 300, and the width controller 400 may be disposed in that order.

A fiber material used for the fiber bundle may include a carbon fiber bundle or a glass fiber bundle. For example, the fiber bundle may be supplied through a pair of transfer rolls (not shown) which are vertically disposed.

The fiber bundle supplied through the transfer rolls passes through the air supply device 100.

FIG. 3A is a side view illustrating an air supply device according to an exemplary embodiment of the present invention, and FIG. 3B is a front view illustrating the air supply device according to the exemplary embodiment of the present invention.

As shown in FIGS. 3A-3B, the air supply device 100 includes an air blower 110 to blow compressed air to the fiber bundle, and an air control valve 120 to control an amount of air exhausted from the air blower 110. In this case, a height of the air blower 110 may be controlled.

A user may control a desired intensity and amount of compressed air to be applied to the fiber bundle by controlling the height of the air blower 110 and controlling the amount of air exhausted from the air blower 110 with the air control valve 120.

The compressed air exhausted from the air supply device 100 preferably collides with the fiber bundle, so that the fiber bundle is bent and forcibly widened in a width direction. The fiber bundle is preliminarily opened due to the force in the width direction.

-   The fiber bundle passing through the air supply device 100 is     supplied to the vertical vibration device 200.

FIG. 4A is a side view illustrating a vertical vibration device according to an exemplary embodiment of the present invention, and FIG. 4B is a front view illustrating the vertical vibration device according to the exemplary embodiment of the present invention.

As shown in FIGS. 4A-4B, the vertical vibration device 200 include a vertical vibration roll 210 to transfer the fiber bundle, and a vertical motor 220 to provide driving torque to the vertical vibration roll 210.

The vertical vibration roll 210 is moved in up and down directions at a predetermined time period by the vertical motor 220, and collides with the fiber bundle passing through an upper side of the vertical vibration roll 210 at a predetermined time period.

If the fiber bundle collides with the vertical vibration roll 210, a tension of the fiber bundle is increased, and a bent amount of the fiber bundle is increased. Further, if the fiber bundle does not collide with the vertical vibration roll 210, the tension of the fiber bundle is reduced so that the bent amount of the fiber bundle is reduced.

In this way, the tension of the fiber bundle is changed so that the bent amount of the fiber bundle is changed. Accordingly, force in a width direction is applied to the fiber bundle so that the fiber bundle is opened.

The fiber bundle passing through the vertical vibration device 200 is supplied to the horizontal vibration device 300. The horizontal vibration device 300 includes a plurality of horizontal vibration rolls having different shapes. In this case, the plurality of horizontal vibration rolls may be disposed differently according to a type of fiber bundle.

First, the shapes of the plurality of horizontal vibration rolls will be described in detail.

FIG. 5A is a plan view illustrating a first horizontal vibration roll according to an exemplary embodiment of the present invention, and FIG. 5B is cross-sectional view illustrating the first horizontal vibration roll according to the exemplary embodiment of the present invention.

As shown in FIGS. 5A-5B, one of the plurality of horizontal vibration rolls may be a first horizontal vibration roll 310 having a cylindrical shape with a diameter that becomes gradually reduced in the direction of an exterior circumference from a center. In particular, the first horizontal vibration roll 310 may have a cylindrical shape with a convexly protruding center. In other words, as shown in FIG. 5B, an exterior circumference 312 of the first horizontal vibration roll 310 has an elliptical shape based on a cross-sectional view.

A center of the first horizontal vibration roll 310 has a hole, and a first shaft (not shown) may be inserted into the center hole of the first horizontal vibration roll 310. The first shaft receives power from a separate driving source (not shown) and is moved in a horizontal direction (i.e., width direction) in a predetermined time period. Accordingly, the first horizontal vibration roll 310 is moved in the horizontal direction so that vibration is applied to the fiber bundle in the horizontal direction.

As shown in FIG. 1, a pair of first guide rolls 320 may be provided at a lower portion of the first horizontal vibration roll 310. The fiber bundle passes between the first horizontal vibration roll 310 and the pair of first guide rolls 320 so that a predetermined amount of tension is applied to the fiber bundle. In a state that the tension is applied to the fiber bundle, the force is applied to the fiber bundle by horizontal direction vibration of the first horizontal vibration roll 310 so that the fiber bundle is opened.

In this case, since the first horizontal vibration roll 310 include a center having a convexly cylindrical shape, a center portion of the fiber bundle is bent as compared with front right and left ends of the fiber bundle. Accordingly, a focused fiber bundle is opened.

FIG. 6A is a plan view illustrating a second horizontal vibration roll according to an exemplary embodiment of the present invention, and FIG. 6B is cross-sectional view illustrating the second horizontal vibration roll according to the exemplary embodiment of the present invention.

As shown in FIGS. 6A-6B, another of the plurality of horizontal vibration rolls may be a second horizontal vibration roll 330 having a cylindrical shape where a diameter becomes gradually reduced in the direction of an exterior circumference from a center, and block walls 334 are formed at both front ends of the second horizontal vibration roll 330. In particular, the second horizontal vibration roll 330 may include a center having a convexly protruding cylindrical shape. In other words, as shown in FIG. 6B, an exterior circumference 332 of the second horizontal vibration roll 330 has an elliptical shape based on a cross-sectional view.

In this case, it is preferable that a curvature radius R2 of an exterior circumference 332 of the second horizontal vibration roll 330 is greater than a curvature radius R1 of an exterior circumference 332 of the first horizontal vibration roll 330. In particular, the exterior circumference 332 of the second horizontal vibration roll 330 is formed smoother than the exterior circumference 332 of the first horizontal vibration roll 330.

A center of the second horizontal vibration roll 330 has a hole, and a second shaft (not shown) may be inserted into the center hole of the second horizontal vibration roll 330. The second shaft receives power from a separate driving source (not shown) and is moved in a horizontal direction (i.e., width direction) in a predetermined time period. Accordingly, the second horizontal vibration roll 330 is moved in the horizontal direction so that vibration is applied to the fiber bundle in the horizontal direction.

As shown in FIG. 1, a pair of second guide rolls 340 may be provided at a lower portion of the first horizontal vibration roll 330. The fiber bundle passes between the second horizontal vibration roll 330 and the pair of second guide rolls 340 so that a predetermined amount of tension is applied to the fiber bundle. In a state that the tension is applied to the fiber bundle, the force is applied to the fiber bundle by horizontal direction vibration of the second horizontal vibration roll 330 so that the fiber bundle is opened.

FIG. 7A is a plan view illustrating a third horizontal vibration roll according to an exemplary embodiment of the present invention, and FIG. 7B is cross-sectional view illustrating the third horizontal vibration roll according to the exemplary embodiment of the present invention.

As shown in FIGS. 7A-7B, another of the plurality of horizontal vibration rolls may be a third horizontal vibration roll 350 having a cylindrical shape with the same diameter. In particular, as shown in FIG. 7B, an exterior circumference of the third horizontal vibration roll 350 has a straight shape.

A center of the third horizontal vibration roll 350 has a hole, and a third shaft (not shown) may be inserted into the center hole of the third horizontal vibration roll 350. The third shaft receives power from a separate driving source (not shown) and is moved in a horizontal direction (i.e., width direction) in a predetermined time period. Accordingly, the third horizontal vibration roll 350 is moved in the horizontal direction so that vibration is applied to the fiber bundle in the horizontal direction.

As shown in FIG. 1, a pair of third guide rolls 360 may be provided at a lower portion of the third horizontal vibration roll 350. The fiber bundle passes between the third horizontal vibration roll 350 and the pair of third guide rolls 360 so that a predetermined amount of tension is applied to the fiber bundle. In a state that the tension is applied to the fiber bundle, the force is applied to the fiber bundle by horizontal direction vibration of the third horizontal vibration roll 310 so that the fiber bundle is opened.

FIG. 8A is a plan view illustrating a fourth horizontal vibration roll according to an exemplary embodiment of the present invention, and FIG. 8B is a cross-sectional view illustrating the fourth horizontal vibration roll according to the exemplary embodiment of the present invention

As shown in FIG. 8, the other of the plurality of horizontal vibration rolls may be a fourth horizontal vibration roll 370 having a cylindrical shape with the same diameter, where protrusions and depressions are formed at an exterior circumference of the fourth horizontal vibration roll 370, and block walls 374 are formed at both front ends of the fourth horizontal vibration roll 370.

In particular, as shown in FIG. 8B, an exterior circumference of the fourth horizontal vibration roll 370 has a straight shape. In this case, protrusions and depressions are formed at an exterior circumference of the fourth horizontal vibration roll 370 (see the notation “Z” of FIG. 8B).

A center of the fourth horizontal vibration roll 370 has a hole, and a second shaft (not shown) may be inserted into the center hole of the fourth horizontal vibration roll 370. The fourth shaft receives power from a separate driving source (not shown) and is moved in a horizontal direction (i.e., width direction) in a predetermined time period. Accordingly, the fourth horizontal vibration roll 370 is moved in the horizontal direction so that vibration is applied to the fiber bundle in the horizontal direction.

As shown in FIG. 2, a pair of fourth guide rolls 380 may be provided at a lower portion of the fourth horizontal vibration roll 370. The fiber bundle passes between the fourth horizontal vibration roll 370 and the pair of fourth guide rolls 380 so that a predetermined amount of tension is applied to the fiber bundle. In a state that the tension is applied to the fiber bundle, the force is applied to the fiber bundle by horizontal direction vibration of the fourth horizontal vibration roll 370 so that the fiber bundle is opened.

Hereinafter, the opening apparatus of a fiber bundle according to a type of fiber will be described in detail.

First, a case where the fiber bundle is a carbon fiber is described. In a case of the carbon fiber, as shown in FIG. 1, in the plurality of horizontal vibration rolls, a first horizontal vibration roll 310, a second horizontal vibration roll 330, and a third horizontal vibration roll 350 are disposed in that order, so that the plurality of horizontal vibration rolls apply horizontal direction vibration to the fiber bundle.

Since the carbon fiber has a lower specific gravity than that of the glass fiber, the opening effect due to the air supply device 100 and the vertical vibration device 200 is higher than that of the glass fiber, but a compaction phenomenon of the fiber bundle is greater than that of the glass fiber.

Accordingly, compaction of the fiber bundle is released by primarily applying horizontal direction vibration to the fiber bundle through the first horizontal vibration roll 310 having an exterior circumference with a relatively small curvature radius, horizontal direction vibration is secondarily applied to the fiber bundle through the second horizontal vibration roll 330 having an exterior circumference with a relatively large curvature radius, and horizontal direction vibration is finally applied to the fiber bundle through the third horizontal vibration roll 350 having a flat exterior circumference so that opening efficiency may be improved while minimizing damage to the fiber.

Next, a case where the fiber bundle is a glass fiber is described. In a case of the glass fiber, as shown in FIG. 2, in the plurality of horizontal vibration rolls, a third horizontal vibration roll 350, a first horizontal vibration roll 310, and a fourth horizontal vibration roll 370 are disposed in that order, so that the plurality of horizontal vibration rolls apply horizontal direction vibration to the fiber bundle.

Since the glass fiber has a higher specific gravity than that of the carbon fiber, the opening effect due to the air supply device 100 and the vertical vibration device 200 is lower than that of the carbon fiber.

Accordingly, in order to improve opening efficiency of the fiber bundle, first, after uniform shear force is applied to the fiber bundle through the third horizontal vibration roll 350 having a flat exterior circumference, full compaction of the fiber bundle is released through the first vibration roll 310 having an exterior circumference with a small curvature radius. Finally, if vibration is applied to the flat exterior circumference through the fourth horizontal vibration roll 370 formed therein with protrusions and depressions, compaction between filaments remaining on the fiber bundle may be released.

Unlike the carbon fiber, after compressed air is applied to the glass fiber by the air supply device, if horizontal direction vibration is applied to the fiber bundle through a vibration roller having an exterior circumference with a small curvature radius, the compaction between filaments of the fiber bundle becomes severe.

Since the specific gravity of the glass fiber is large, the opening effect due to the compressed air is not large. Accordingly, if the horizontal direction vibration is applied to the fiber bundle through a horizontal vibration roll with an exterior circumference having a small curvature radius in a state that the fiber bundle is compacted, the fiber is split so that opening efficiency is deteriorated. Accordingly, the horizontal vibration roll is disposed in the above order so that the opening efficiency of a glass fiber bundle may be improved.

Hereinafter, the width controller will be described in detail with reference the accompanying drawings.

FIG. 9A is a plan view illustrating a width controller according to an exemplary embodiment of the present invention, and FIG. 9B is a side view illustrating the width controller according to the exemplary embodiment of the present invention.

As shown in FIGS. 9A-9B, the width controller 400 is a device arranged so that the fiber bundle opened by passing through the horizontal vibration device 300 is exhausted with a desired width.

To open the fiber bundle through the air supply device 100, the vertical vibration device 200 and the horizontal vibration device 300 are provided for the purpose of improving impregnation of the fiber bundle. After the fiber bundle is opened, the impregnation is maintained even if the fiber bundle is physically combined.

Rather, after the fiber bundle is opened, it is advantageous to collect the fiber bundle with a predetermined width in order to manufacture the prepreg. Accordingly, there is a need to collect the fiber bundle with a predetermined width through the width controller 400.

The width controller 400 includes a bottom plate 410, guide walls 420 provided at both sides of the bottom plate to guide the fiber bundle, and a guide plate 430 connected to the guide wall by a hinge. In this case, a ruler 440 for displaying an opening amount of the guide plate 430 may be formed on the bottom plate 410.

The guide plate 430 is coupled with the guide wall 420 by a hinge, so that an opening amount of the guide plate 430 is adjusted by operation of the user or a separate driving torque. Accordingly, the user may control the fiber bundle to be exhausted with a desired width.

In this case, the width of the fiber bundle may be exactly adjusted through a ruler 440 which is formed on the bottom plate 410.

While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. 

What is claimed is:
 1. An opening apparatus of a fiber bundle, comprising a horizontal vibration device including a plurality of horizontal vibration rolls configured to apply horizontal direction vibration to the fiber bundle according to a type of the fiber bundle, wherein the horizontal vibration rolls have different shapes.
 2. The opening apparatus of claim 1, wherein one of the plurality of horizontal vibration rolls comprises a first horizontal vibration roll having a cylindrical shape in which a diameter becomes gradually reduced in a direction of an exterior circumference from a center thereof.
 3. The opening apparatus of claim 2, wherein another of the plurality of horizontal vibration rolls comprises a second horizontal vibration roll having a cylindrical shape in which a diameter becomes gradually reduced in a direction of an exterior circumference from a center thereof.
 4. The opening apparatus of claim 3, wherein another of the plurality of horizontal vibration rolls comprises a third horizontal vibration roll having a cylindrical shape having a same diameter.
 5. The opening apparatus of a fiber bundle of claim 4, wherein another of the plurality of horizontal vibration rolls comprises a fourth horizontal vibration roll having a cylindrical shape having a same diameter and including protrusions and depressions formed at an exterior circumference of the fourth horizontal vibration roll.
 6. The opening apparatus of claim 5, wherein when the fiber bundle is a carbon fiber, the horizontal direction vibration is applied to the fiber bundle in an order of the first horizontal vibration roll, the second horizontal vibration roll, and the third horizontal vibration roll.
 7. The opening apparatus of claim 6, wherein a curvature radius of an exterior circumference of the second horizontal vibration roll is greater than a curvature radius of an exterior circumference of the first horizontal vibration roll.
 8. The opening apparatus of claim 5, wherein when the fiber bundle is a glass fiber, the horizontal direction vibration is applied to the fiber bundle in an order of the third horizontal vibration roll, the first horizontal vibration roll, and the fourth horizontal vibration roll.
 9. The opening apparatus of claim 1, further comprising a width controller provided at a lower stream region of the horizontal vibration device to control a width of the fiber bundle.
 10. The opening apparatus of claim 9, wherein the width controller comprises: a bottom plate; guide walls provided at both sides of the bottom plate to guide the fiber bundle, respectively; and guide plates coupled with the guide walls by a hinge, respectively.
 11. The opening apparatus of claim 10, wherein the width controller further comprises a ruler to display an open amount of the guide plate.
 12. The opening apparatus of claim 1, further comprising a horizontal vibration device provided at an upper stream region of the horizontal vibration device to apply the horizontal direction vibration to the fiber bundle.
 13. The opening apparatus of claim 12, further comprising an air supply device provided at the upper stream region of the horizontal vibration device to blow compressed air into the fiber bundle.
 14. The opening apparatus of claim 13, wherein the air supply device comprises: an air blower to generate compressed air; and an air control valve to control an air amount of the air blower. 